How to set server password on Xbox?

Hey! I'm new to the game and need to play solo atm, so I need to set a password. I'm on Xbox series x btw. Looked for help but only found PC guides, so...

Ah, 1 other question, sorry! Do I even need a password? Can people even join if I haven't taken steps to make it public or whatever?

Thank you very much in advance. I always attempt to find answers myself before asking, so I apologize. Thanks!